一直以来在写程序的时候觉得有许多数据是运行这个程序本身需要的，和用户的数据没有什么关系，都放在一个库里有点不合适。分开放要同时连接两个以上的大型数据库（客户的数据一般都放在大型的数据库里面）好象也不太合适。debug="0" />
这个类的源代码如下 ：
package org.apache.derby.tomcat;import org.apache.derby.tomcat.ServerLifecycleListener;public class ServerLifecycleListenerWithNetworkServer extends ServerLifecycleListener
{
public static final String START_NETWORK_SERVER = "derby.drda.startNetworkServer"; public static final String HOST = "derby.drda.host"; public static final String PORT_NUMBER = "derby.drda.portNumber";
protected void initializeCloudscape() { System.setProperty( START_NETWORK_SERVER, "true" ); super.initializeCloudscape();
}
}package org.apache.derby.tomcat;import java.sql.DriverManager;import java.sql.SQLException;import org.apache.catalina.Lifecycle;import org.apache.catalina.LifecycleEvent;import org.apache.catalina.LifecycleListener;public class ServerLifecycleListener implements LifecycleListener { public static final String DRIVER_CLASSNAME = "org.apache.derby.jdbc.EmbeddedDriver"; public static final String SHUTDOWN_URL = "jdbc:derby:;shutdown=true"; public static final String SHUTDOWN_MESSAGE = "Cloudscape system shutdown."; public static final String MSG_INIT_SUCCESS = "Cloudscape JDBC driver loaded successfully"; public static final String MSG_INIT_CLASS_NOT_FOUND = "The Cloudscape JDBC driver (" + DRIVER_CLASSNAME + ") could not be found. Make sure the appropriate JAR" + " files are available."; public static final String MSG_TERM_SUCCESS = "Cloudscape shutdown was successful."; public static final String MSG_TERM_FAILURE = "Unexpected Exception was caught from the Cloudscape shutdown."; public void lifecycleEvent(LifecycleEvent argEvent) { if (argEvent.getType().equals(Lifecycle.START_EVENT)) { this.initializeCloudscape(); } else if (argEvent.getType().equals(Lifecycle.STOP_EVENT)) { this.shutdownCloudscape(); } } protected void initializeCloudscape() { try { Class.forName(DRIVER_CLASSNAME); System.out.println(MSG_INIT_SUCCESS); } catch (ClassNotFoundException varException) { System.out.println(MSG_INIT_CLASS_NOT_FOUND); varException.printStackTrace(); } } protected void shutdownCloudscape() { try { DriverManager.getConnection(SHUTDOWN_URL); } catch (SQLException varException) { if (varException.getMessage().equals(SHUTDOWN_MESSAGE)) { System.out.println(MSG_TERM_SUCCESS); } else { System.out.println(MSG_TERM_FAILURE); varException.printStackTrace(); } } }}
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